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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Dual-Site Modulation of Mg2+ Desolvation Beyond the Primary Solvation Shell in Magnesium Battery Electrolytes
Yujie Deng1,2, Guoyang Li1,2, Rongrui Deng3
1College of Materials Science and Engineering, National Engineering Research for Magnesium Alloys, Chongqing University, Chongqing, 40044, China.
None:
High overpotential and instability of Mg anode reactions limit the development of halide-free Mg battery electrolytes. Here, we report 7-aminoindole (7AID), a predominantly noncoordinating additive that modulates solvation via CH-π and hydrogen-bonding interactions with both Mg2+-bound and free ether solvents. These outer-shell and bulk-phase interactions weaken Mg2+···solvent binding, enhance solvent mobility, and lower the desolvation barrier. As a result, Mg plating/stripping overpotentials are significantly reduced and interfacial stability is improved. Compared to strongly coordinating additives, this approach suppresses parasitic reactions and enables more stable cycling. This work presents a solvation-targeted additive design paradigm beyond the primary coordination shell for advancing multivalent battery electrolytes.
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